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Closes #463

See merge request memri/pod!401

Sz/parametrize nr of opened connections to the db

See merge request memri/pod!400

added perf scenario that somewhat reflects current consumer app behavior

See merge request memri/pod!399

Sz/schema check improvements

See merge request memri/pod!397

cannot create object outside schema
cannot create object with property from other object schema

Sz/track token expiry

See merge request memri/pod!396

added posibility to restrict pod origins for plugins

See merge request memri/pod!394

increased number of connections in the pool

See merge request memri/pod!395

attaching to a plugin

See merge request memri/pod!393

Changing webserver to actix-web

See merge request memri/pod!392

Sz/make deployment for shared plugins

See merge request memri/pod!390

k8s changes for gpu

See merge request memri/pod!389

Sz/return proper response in case of plugin api failure

See merge request memri/pod!388

Refactor error handling in the POD.

Sz/support for gpu model execution

See merge request memri/pod!387

Update docs/HTTP_API.md

See merge request memri/pod!386

fixed k8s version

See merge request !385

Sz/refactoring oauth2 flow

See merge request !384

Use unique pkceVerifier string upon auth_url and authorize requests.